ca·nes·cent 
(kə-nĕsənt)
(kə-nĕsənt)adj.
1. Biology Covered with short, fine whitish or grayish hairs or down; hoary.
2. Turning white or grayish.
[Latin cānēscēns, cānēscent-, present participle of cānēscere, inchoative of cānēre, to be white, from cānus, white; see kas- in the Appendix of Indo-European roots.]
ca·nescence n.